Spring boot HeaderWriterFilter overrides header created in controller - spring

Question

When I add a header to the responseEntity in the Controller, it is not added to the response. I debug the code, an when it reach the "HeaderWriterFilter" it adds default header, but it has no track of the one added in the Controller.
#RequestMapping(
value = "/get-file",
method = RequestMethod.GET
)
public ResponseEntity<Resource> download(Principal principal, Long fileId) throws IOException {
if (principal == null) {
throw new UsernameNotFoundException("User not found.");
}
try {
User loggedInUser = ((LoggedInUserDetails) ((UsernamePasswordAuthenticationToken) principal).getPrincipal()).getLoggedInUser();
// Get file
File file = this.fileService.getById(loggedInUser, fileId);
if (file == null) {
return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(null);
}
// Get file for download
java.io.File physicalFile = new java.io.File(file.getUrl());
if (file == null) {
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(null);
}
InputStreamResource resource = new InputStreamResource(new FileInputStream(physicalFile));
HttpHeaders headers = new HttpHeaders();
headers.add("test", "test.yaml");
return ResponseEntity.ok()
.headers(headers)
.contentType(MediaType.parseMediaType("application/octet-stream"))
.contentLength(physicalFile.length())
.body(resource);
}
catch (FileNotFoundException e) {
e.printStackTrace();
return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(null);
}
catch (Exception e) {
e.printStackTrace();
return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(null);
}
}

Answer 1

The problem was a missing header in WebSecurityConfig. I solved the problem adding
configuration.setExposedHeaders(Arrays.asList("fileName"));
in CorsConfigurationSource.